Siemens SIMATIC ET 200AL, System Manual

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Functions
5.5 Intelligent DP slaves (I-slaves)
PROFIBUS with STEP 7 V13
82
Function Manual, 12/2014, A5E03775446-AC
①
Data exchange between higher-level DP master and normal DP slave
In this way, the DP master and the DP slave exchange data through PROFIBUS.
②
Data exchange between higher-level DP master and I-slave
In this way, the DP master and the slave exchange data through PROFIBUS.
The data exchange between a higher-level DP master and an I-slave is based on the
conventional DP master/DP slave relationship.
For the higher-level DP master, the transfer areas of the I-slave represent submodules of a
DP slave.
The output data of the DP master is the input data of the I-slave. Analogously, the input data
of the DP master is the output data of the I-slave.
③
Transfer relationship between the user program and the transfer area
In this way, the user program and the transfer area exchange input and output data.
④
Data exchange between the user program and the I/O of the I-slave
In this way, the user program and the centralized I/O of the I-slave exchange input and
output data.
5.5.3 Configuring an I-slave
Requirements for configuring an I-slave
The I-slave consists of:
●
A CPU from S7-1500 and a communications module CM 1542-5/CP 1542-5
(STEP 7 as of V12)
● A CPU from ET 200SP and a communications module CM DP (STEP 7 as of V13 SP1)